Many countries around the world observe Daylight Saving Time (DST), also known as Summer Time,
during their summer. This transfers one hour of morning daylight
to the evening. To accomplish this the clocks are set
ahead one hour in the spring and turned back one hour in the fall.

The rules have been researched for the years starting around the year 2000 to the present.
The future dates of this observance are set by the government of the
country or locality and are subject to change.
Also see FAQs and DST adjustments.

Calendars created for all future years to 2099 will use the rules in this table.

United States: Arizona and Hawaii do not observe DST. Some cities in Arizona, such as Chinle, Kayenta and Monument Valley Navajo Tribal Park in the Navajo Nation do observe DST.
Indiana currently observes DST, but this has varied over previous years, see
Time in Indiana at
Wikipedia.

Canada: Saskatchewan does not observe DST. For some provinces, including Saskatchewan, there are
smaller geographic areas within them that set their own rules, see
Time in Canada at
Wikipedia.

In Australia, the states of Queensland, Western Australia and the Northern Territory do not observe DST.

For the 2000 Olympics, Australia started DST on Sunday, August 27.

Egypt cancelled the observance of DST in April 2011, effective immediately for that year. This site presumes it is also cancelled for all future years.

For the year 2011, the Falkland Islands will stay on DST all year long. Outside of Stanley and the RAF base at Mount Pleasant,
Camp Time is used which does not observe DST.

Iran starts DST on the first day of Farvardin in the Iranian calendar and ends on the last day of Shahrivar. The dates used on this site
are approximate. See
Iran Daylight Saving time at
Wikipedia.

Currently, Israeli law defines the end of DST to start on the Friday before the last Sunday in March and end on the last Sunday in October.
See
Israel Daylight Saving time at
Wikipedia.

Some Mexican cities that border the United States and all of the state of Baja California follow the U.S. DST rules.

The state of Sonora does not observe DST.

In July 2014, Russia voted to stop observing DST effective that year and to make Standard (Winter) Time permanent.
Russia will stop observing DST on Sunday, October 26, 2014. For the year 2015 and all future years,
Russia will stay on Standard (Winter) Time all year long. See
Time in Russia at
Wikipedia.

For the year 2011, Turkey moved the start of DST to Monday, March 28, one day later than the rest of Europe, to avoid disrupting the national university-entrance examinations held on 27 March.

For the year 2014, Turkey switched to European Summer Time on Monday, March 31, one day later than the rest of Europe, to avoid disrupting the local elections held on 30 March.

In 2016, Turkey cancelled DST observance and decided to stay on Summer Time (+1 hour to the base time zone) all year. This effectively means the country observes permanent UTC+3, instead of the existing UTC+2. This was due to the calling of a snap general election on Thursday, 8 September.